linux-kernel - [PATCH] usb: f_fs: Drop check on Reserved1 field on OS_DESC_EXT

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Message-Id: <20171109163429.8697-1-john@metanate.com>
Date:   Thu,  9 Nov 2017 16:34:29 +0000
From:   John Keeping <john@...anate.com>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vincent Pelletier <plr.vincent@...il.com>,
        Jim Lin <jilin@...dia.com>,
        Janusz Dziedzic <januszx.dziedzic@...ux.intel.com>,
        John Keeping <john@...anate.com>, stable@...r.kernel.org
Subject: [PATCH] usb: f_fs: Drop check on Reserved1 field on OS_DESC_EXT_COMPAT

This check has gone through several incompatible variations in commits
53642399aa71 ("usb: gadget: f_fs: Fix wrong check on reserved1 of
OS_DESC_EXT_COMPAT"), 354bc45bf329 ("usb: gadget: f_fs: Fix ExtCompat
descriptor validation") and 3ba534df815f ("Revert "usb: gadget: f_fs:
Fix ExtCompat descriptor validation"") after initially being introduced
in commit f0175ab51993 ("usb: gadget: f_fs: OS descriptors support").

The various changes make it impossible for a single userspace
implementation to work with different kernel versions, so let's just
drop the condition to avoid breaking userspace.

Fixes: 53642399aa71 ("usb: gadget: f_fs: Fix wrong check on reserved1 of OS_DESC_EXT_COMPAT")
Cc: stable@...r.kernel.org # v4.7+
Signed-off-by: John Keeping <john@...anate.com>
---
 drivers/usb/gadget/function/f_fs.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 652397eda6d6..0d9962834345 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2282,8 +2282,7 @@ static int __ffs_data_do_os_desc(enum ffs_os_desc_type type,
 		int i;
 
 		if (len < sizeof(*d) ||
-		    d->bFirstInterfaceNumber >= ffs->interfaces_count ||
-		    !d->Reserved1)
+		    d->bFirstInterfaceNumber >= ffs->interfaces_count)
 			return -EINVAL;
 		for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i)
 			if (d->Reserved2[i])
-- 
2.15.0